import java.util.*;
import java.io.*;

public class Queue1Task {
    FastScanner in;
    PrintWriter out;

    public class Queue {
        private Object[] elements = new Object[10];
        private int start = 0;
        private int end = 0;
        private int size = 0;

        public int size() {
            return size;
        }

        public void ensureCapacity(int capacity) {
            if (elements.length >= capacity) {
                return;
            }
            Object[] newElements  = new Object[2 * capacity];
            for (int i = 0; i < size; i++) {
                if (i < size - start) {
                    newElements[i] = elements[start + i];
                } else {
                    newElements[i] = elements[i + start - size()];
                }
            }
            start = 0;
            end = size();
            elements = newElements;
        }

        public void push(Object e) {
            ensureCapacity(size() + 1);
            elements[end] = e;
            end = (end + 1) % elements.length;
            size++;
        }

        public Object pop() {
            Object x = elements[start];
            start = (start + 1) % elements.length;
            size--;

            return x;
        }
    }

    public void solve() throws IOException {
        String phrase;
        char ch;
        Queue q = new Queue();
        int m = Integer.parseInt(in.next());
        for (int i = 0; i < m; i++) {
            phrase = in.next();

            ch = phrase.charAt(0);

            if (ch == '+') {
                q.push(in.nextInt());
            }

            if (ch == '-') {
                out.println(q.pop());
            }
        }
    }

    public void run() {
        try {
            in = new FastScanner(new File("queue1.in"));
            out = new PrintWriter(new File("queue1.out"));

            solve();

            out.close();
        } catch (IOException e) {
                e.printStackTrace();
        }
    }

    class FastScanner {
        BufferedReader br;
        StringTokenizer st;

        FastScanner(File f) {
            try {
                br = new BufferedReader(new FileReader(f));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }

        String next() {
            while (st == null || !st.hasMoreTokens()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }
    }

    public static void main(String[] arg) {
        new Queue1Task().run();
    }
}